As the name indicates, the pressure vessels are characterized by withstanding pressure. According to the authorities, a vessel with pressure greater than 0.5 bar g is defined as a pressure vessel. Within the EU, pressure vessels can be calculated according to the standard EN 13445.

It should be noted that a vacuum vessel is not defined as a pressure vessel.

But it often proves that full vacuum (-1.0 bar g) is determeting the design size, and become more critical with increasing vessel volume. To optimize the structure, vaccumrings may be added to the shell. The best design must be assessed in each case, with our sales department.

Used in many industries

Pressure vessels are used in many industries, including the dairy industry, food industry, chemical industry and the pharmaceutical industry. Pressure vessels are usually placed indoors and used within closed systems and process lines. Pressure vessels are used as mixing-, fermentation-, flashing-, high pressure boiling-, pressurized liquid-, aseptic-, gas storage- or buffer vessels.

The pressure vessel is designed with a dome-shaped end in accordance with DIN 28011 (Klöpper) or DIN 28013 (Korbbogen). However, the cones or flat ends may also be used, but the thickness will be thicker than the dome-shaped ends. Pressure vessels may also be constructed to withstand the vaccum which arises during the cleaning process (CIP).


Slightly depending on the dimensions and volume, placing the vessel indoors could be on legs (round or triangle conical) or hang in brackets.

The vessel can also be equipped with a cooling / heating jacket, and the medium in the vessel is then cooled or heated.


When the process temperature is high, very low, or if the process requires stable temperature with time, it will be necessary to insulate the vessel. The insulation thickness may be calculated, but will typically be 50 mm. The insulation jacket may be fully welded stainless steel when bacteriological requirements are high. Alternatively, a rivet mounted aluminum plate can be an advantage economically.

Hygenic requirements

When the hygenic requirements are high for the vessel, the surface requirements, nozzles types and drainability, must be discussed and defined on the quotation stage.

Please contact JH Stålindustri

Our sales department is of course helpful, and shall provide you with the guidance of equipment selection and design of the Stainless steel pressure .